DefinePK

Abstract

In this paper, we introduce a new method, byte-invert transmission, for preventing LED flicker and controlling illumination in visible light communication (VLC). In byte-invert transmission, each data byte is sent in sequence with its inverted version. The inverted byte is an eight-bit data whose bits have been changed to the opposite state of their original value. In this configuration, the average power of the LED light is kept constant regardless of data change, keeping it flicker-free, and the illumination is controlled by changing the duty factor of the return-to-zero (RZ) data waveform. In experiments, the LED optical power was varied from 4.5% to 45% of its DC value by changing the duty factor from 10% to 100%.